In an honest sense, i dont think u can make one clear, it just says about clear nuka colas as an easter egg refrence to Crystal pepsi or pepsi crystal, wichever one it is If you are in the nuka-cola factory then you need to either go through it the long way, or if you can pick very hard locks go through the big double doors in the first room. then you will be on the factory floor, in one of the rooms there is a Mr. handy he asks you for ID, either convince him that you work there or kill him but he has a key to the R&D dept. safe once you have that go back to the building entrance and the room to your left is the R&D dept. there is a safe there, open it and retrieve the recipe. you can sell it to a guy at the red racer factory(up the hill in front of the nuka-cola building exit) if your sp